diff mbox series

[v4,4/6] virtio-net: expose virtio_net_supported_guest_offloads()

Message ID 43679506f3f039a7aa2bdd5b49785107b5dfd7d4.1685704856.git.yin31149@gmail.com
State New
Headers show
Series Vhost-vdpa Shadow Virtqueue Offloads support | expand

Commit Message

Hawkins Jiawei June 2, 2023, 11:52 a.m. UTC 
To support restoring offloads state in vdpa, it is necessary to
expose the function virtio_net_supported_guest_offloads().

According to VirtIO standard, "Upon feature negotiation
corresponding offload gets enabled to preserve backward compatibility.".
Therefore, QEMU uses this function to get the device supported offloads.
This allows QEMU to know the device's defaults and skip the control
message sending if these defaults align with the driver's configuration.

Note that the device's defaults can mismatch the driver's configuration
only at live migration.

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
---
 hw/net/virtio-net.c            | 2 +-
 include/hw/virtio/virtio-net.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 7b27dad6c4..7e8897a8bc 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -874,7 +874,7 @@  static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
     return guest_offloads_mask & features;
 }
 
-static inline uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n)
+uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(n);
     return virtio_net_guest_offloads_by_features(vdev->guest_features);
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index ef234ffe7e..5f5dcb4572 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -227,5 +227,6 @@  size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
                                   unsigned out_num);
 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
                                    const char *type);
+uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n);
 
 #endif